[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f-TDjg3H8FvDE5rSNOmYkGAoa6G0qcJsmHMegnaoSCiQ":3,"g5a-risk:CVE-2019-18277":128},{"success":4,"data":5,"meta":126},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":39,"epssPercentile":26,"epssTimeSeries":40,"severity":41,"affectedProducts":42,"affectedProductsCount":47,"references":48,"referencesCount":78,"weaknesses":79,"weaknessesCount":47,"isActivelyExploited":88,"cisaInfo":26,"otxData":26,"relatedBlogPosts":89,"seoMetadata":90,"configurations":115,"relatedVendorCves":124,"notableEvents":125},"CVE-2019-18277","What is CVE-2019-18277?","A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the \"chunked\" value were not being correctly rejected. The impact was limited but if combined with the \"http-reuse always\" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).","A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the \"chunked\" value were not being correctly ...","2019-10-23T14:15:10.557","2023-11-07T03:06:25.37",7.5,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:N\u002FI:H\u002FA:N",{"CVSSMetricV31":15,"CVSSMetricV30":26,"CVSSMetricV2":29,"CVSSMetricV40":26},[16],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":27,"ImpactScore":28},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":23,"IntegrityImpact":25,"AvailabilityImpact":23,"BaseScore":12,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":23,"ModifiedAttackVector":26,"ModifiedAttackComplexity":26,"ModifiedPrivilegesRequired":26,"ModifiedUserInteraction":26,"ModifiedScope":26,"ModifiedConfidentialityImpact":26,"ModifiedIntegrityImpact":26,"ModifiedAvailabilityImpact":26,"EnvironmentalScore":26,"EnvironmentalSeverity":26},"3.1","NETWORK","LOW","NONE","UNCHANGED","HIGH",null,3.9,3.6,[30],{"Source":17,"Type":18,"CVSSData":31,"BaseSeverity":34,"ExploitabilityScore":37,"ImpactScore":38,"ACInsufInfo":26,"ObtainAllPrivilege":26,"ObtainUserPrivilege":26,"ObtainOtherPrivilege":26,"UserInteractionRequired":26},{"Version":32,"VectorString":33,"AccessVector":21,"AccessComplexity":34,"Authentication":23,"ConfidentialityImpact":23,"IntegrityImpact":35,"AvailabilityImpact":23,"BaseScore":36,"BaseSeverity":26,"Exploitability":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"CollateralDamagePotential":26,"TargetDistribution":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":26,"EnvironmentalScore":26},"2.0","AV:N\u002FAC:M\u002FAu:N\u002FC:N\u002FI:P\u002FA:N","MEDIUM","PARTIAL",4.3,8.6,2.9,0.10068,[39,39,39,39,39,39,39],"High",[43],{"vendor":44,"product":44,"version":45,"criteria":46,"vulnerable":4},"haproxy","*","cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*",1,[49,53,56,60,64,70,74],{"url":50,"source":51,"tags":52},"http:\u002F\u002Flists.opensuse.org\u002Fopensuse-security-announce\u002F2019-12\u002Fmsg00016.html","Opensuse",[],{"url":54,"source":51,"tags":55},"http:\u002F\u002Flists.opensuse.org\u002Fopensuse-security-announce\u002F2019-12\u002Fmsg00019.html",[],{"url":57,"source":58,"tags":59},"https:\u002F\u002Fgit.haproxy.org\u002F?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581","Haproxy",[],{"url":61,"source":62,"tags":63},"https:\u002F\u002Flists.debian.org\u002Fdebian-lts-announce\u002F2022\u002F05\u002Fmsg00045.html","Debian",[],{"url":65,"source":66,"tags":67},"https:\u002F\u002Fnathandavison.com\u002Fblog\u002Fhaproxy-http-request-smuggling","Nathandavison",[68,69],"Exploit","Third Party Advisory",{"url":71,"source":72,"tags":73},"https:\u002F\u002Fusn.ubuntu.com\u002F4174-1\u002F","Ubuntu",[],{"url":75,"source":76,"tags":77},"https:\u002F\u002Fwww.mail-archive.com\u002Fhaproxy%40formilux.org\u002Fmsg34926.html","Mail-archive",[],7,[80],{"id":81,"name":82,"description":83,"extendedDescription":84,"status":85,"abstraction":86,"structure":87},"CWE-444","Inconsistent Interpretation of HTTP Requests ('HTTP Request\u002FResponse Smuggling')","The product acts as an intermediary HTTP agent\n         (such as a proxy or firewall) in the data flow between two\n         entities such as a client and server, but it does not\n         interpret malformed HTTP requests or responses in ways that\n         are consistent with how the messages will be processed by\n         those entities that are at the ultimate destination.","HTTP requests or responses (\"messages\") can be\n\t   malformed or unexpected in ways that cause web servers or\n\t   clients to interpret the messages in different ways than\n\t   intermediary HTTP agents such as load balancers, reverse\n\t   proxies, web caching proxies, application firewalls,\n\t   etc. For example, an adversary may be able to add duplicate\n\t   or different header fields that a client or server might\n\t   interpret as one set of messages, whereas the intermediary\n\t   might interpret the same sequence of bytes as a different\n\t   set of messages. For example, discrepancies can arise in\n\t   how to handle duplicate headers like two Transfer-encoding\n\t   (TE) or two Content-length (CL), or the malicious HTTP\n\t   message will have different headers for TE and\n\t   CL.\nThe inconsistent parsing and interpretation of messages\n\t   can allow the adversary to \"smuggle\" a message to the\n\t   client\u002Fserver without the intermediary being aware of it.\nThis weakness is usually the result of the usage\n\t   of outdated or incompatible HTTP protocol versions in the\n\t   HTTP agents.","Incomplete","Base","Simple",false,[],{"title":91,"metaDescription":92,"keywords":93,"canonicalUrl":94,"structuredData":95},"What is CVE-2019-18277? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2019-18277, a high severity cyber security vulnerability from 2019. A flaw was found in HAProxy before 2.0.6. In legacy mode, m...","CVE-2019-18277, CVE-2019-18277 vulnerability, CVE-2019-18277 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2019, CVSS score, exploit, patch, remediation, haproxy security, haproxy vulnerability","\u002Fwhat-is\u002Fcve-2019-18277",{"@context":96,"@type":97,"headline":91,"description":92,"datePublished":10,"dateModified":11,"author":98,"publisher":102,"about":106,"mainEntityOfPage":110,"articleSection":113,"keywords":114},"https:\u002F\u002Fschema.org","TechArticle",{"@type":99,"name":100,"url":101},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":99,"name":100,"url":101,"logo":103},{"@type":104,"url":105},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":107,"name":6,"description":108,"additionalType":109},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":111,"@id":112},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2019-18277","Cybersecurity","CVE-2019-18277, CVE-2019-18277 vulnerability, CVE-2019-18277 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[116],{"Operator":26,"Negate":26,"Nodes":117},[118],{"Operator":119,"Negate":26,"CPEMatch":120},"OR",[121],{"Vulnerable":4,"Criteria":46,"MatchCriteriaID":122,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":123,"VersionEndIncluding":26},"B76D46D9-8507-4E75-AFCD-D8BADBC38ADC","2.0.6",[],[],{"lastModified":11,"cacheTime":127,"version":32},1792264462400,{"score":129,"band":130,"action":131,"scoredAt":132},48,"Medium","Plan remediation","2026-10-16T06:47:06.007753+00:00"]